Phenergan

"April 24, 2014 -- As many as 4 in 10 Americans have sneezing, runny nose, and watery eyes due to allergies. If you're one of them, allergy shots can help ease your reaction to the plants, insects, or animals that trigger your symptoms. But they r"...

Promethazine HCl is a racemic compound; the empirical formula is C17H20N2S•HCl
and its molecular weight is 320.88.

Promethazine HCl, a phenothiazine derivative, is designated chemically as 10H-Phenothiazine-10-ethanamine,
N,N,alpha;-trimethyl-, monohydrochloride, (±)- with the following
structural formula:

Promethazine HCl occurs as a white to faint yellow, practically odorless, crystalline powder which slowly oxidizes and turns blue on prolonged exposure to air. It is freely soluble in water and soluble in alcohol.

What are the possible side effects of oral promethazine (Pentazine, Phenergan)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using promethazine and call your doctor at once if you have any of these serious side effects:

What are the precautions when taking promethazine (Phenergan)?

See also Warning section.

Before taking promethazine, tell your doctor or pharmacist if you are allergic to it; or to any other phenothiazines (such as prochlorperazine); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.